[Numpy-discussion] searchsorted
Nadav Horesh
nadavh at visionsense.com
Tue Jun 1 06:32:05 CDT 2004
I am currently working on a simulation that makes a heavy use of
searchsorted. But it does not precisely fit to what I need --- if a
value v is between p and q searchsorted returns the index of q, while
what I need is the index of p.
Currently my solution is to turn to floating points numbers:
======================================
Python 2.3.4 (#1, May 31 2004, 09:13:03)
[GCC 3.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
from numarray import *
bins = array((0,10,20,30))
val = array((10, 15))
searchsorted(bins, val)
array([1, 2]) # I really would like to get array([1, 1])
# Here is the trick:
fb = bins - 0.1
fb
array([ -0.1, 9.9, 19.9, 29.9])
searchsorted(fb, val) - 1
array([1, 1]) # That's it!
============================================
My questions are:
1. Is there a more elegant solution?
2. I am thinking of letting "searchsorted" return a second boolean
array which has the value True for every exact match:
>>> searchsorted(bins, val)
>>> [array([1, 2]), array([1, 0], type=Bool)]
Any comments?
Nadav.
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